Sewing machine attachment for mending runs in sheer fabrics



Aug. 18, 1931. GOODMAN ETAL 1,819,161

SEWING MACHINE ATTACHMENT FOR MENDING' RUNS IN SHEER FABRICS Filed May 19, 1930 I/WENTd/PS Lows Gaadrrmn Danie! LFriedr/mrz WW H Patented Aug. 18, 1931 PATENT oFFicE LOUIS GOODMAN AND DANIEL L.

FRIEDMAN, OF NEW YGRK, N. Y.

SEWING MACHINE ATTACHMENT FOR- IVIENDIN G RUNS IN SHEER FABRICS Application filed m 19,

This invention relates to new and useful improvements in a sewing machine attachment for mending runs in sheer knitted fabrics, such as used for hosiery and the like.

The invention has for an object the provision of a device of the class'mentioned which is of simple durable construction, dependable in use and efiicient in action, and

which can be manufactured and sold at areasonable cost.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following-description and accompanying drawings, and to the appended claims in which the various novel features of the invention are more particularly set forth. v

In the accompanying drawings forming a material part of this disclosure Fig. 1 is a side elevational view ofan attachment constructed according to this invention.

Fig. 2 is an end elevational view looking in the direction of the line 2-2 of Fig. 1.

Fig. 3 is a horizontal sectional view taken on the line 33 of Fig. 1. r

Fig. 4 isan enlarged detailed view of a portion of Fig. 2.

The sewing machine attachment for mending runs in sheer fabrics comprises a pair of spaced ribbed rollers 10 and 11 rotatively supported on a substitute bobbin cover plate 12 of a sewing machine, a pair of spaced ribbed idler rollers 13 and 14 engageable against said rollers 10 and 11 and supported upon a stem 15 for attachment on the presser foot of a sewing machine, fabric spreading means 16 for support on said stem 15 and engageable against said first rollers 10 and 11, a ribbed driver drum 17 engaging against said first rollers 10 and 11 and supported on said cover plate 12, and means for periodically turning said driver drum 17 and including a foot 18 in the path of motion of the cloth feeder 19 of said sewing machine for advancing sheer fabricbetween said first and second rollers as indicated by dot and dash lines 20 in Fig. 1, timed with a latched needle 21 substituted for the sewing needle of said sewing machine.

1930. Serial No. 453,699.

The cover plate 12 is indicated for substitution forthe ordinary cover plate used to cover the bobbins on sewing machines. These plates slide into and out of place. The ribbed rollers 10 and 11 are preferably rubber covered with ribbed rubber so as to be capable ofrh'olding the transverse threads of a run equally spaced from each other. The rotative mounting of the rollers 10 and 11 upon the plate 12 is accomplished by a block 23 fixed upon the plate, and a screw 24: engaging through the rollers and into the block. The means for holding the rollers 10 and 11 properly spaced is a collar 25 attached between the rollers and coaxially with the screw 24. The stem 15 is cut out at the top for receiving an ordinary set screw adapted to clamp it upon the pressure foot of the sewing machine. The idler rollers 13 and 14 arealso covered with ribbed rubber having the teeth forming the ribs so spaced as to mesh with the teeth forming the ribs in the rollers 10 and 11. The supporting of the idler rollers 13 and let is accomplished by a pintle 26 engaged through the rollers and through the lower portion of the stem 15. The fabric spreading means 14 on said stem comprises a spring rigidly attached upon the stem and formed with spaced'fingers 28 resting upon the rollers 10 and 11 so that the space between the fingers is directly above the space between the rollers. This arrangement allows the needle 21 to pass in within these spacesas hereinafter mentioned. I i

The supporting of the driver roller 17 is 8 accomplished by a screw 29 engaged through the roller and threadedly engaging within the block 23. The driver drum 17is also covered with ribbed rubber having its teeth so spaced as to mesh with the teeth of the ribs of the rollers 10 and 11. The means for periodically turning said driver drum comprises said foot 18 which is slidably supported in a standard 30 projecting from the bottom of the plate 12,.and .pivotally connects with a lever 31. The other endof the lever 31 pivotally connects with the'stem 32 of a rack 33 slidably supported by the stem 32 engaging within it Standard 34: projecting from the bottom of the plate 12. A collar 35 is adjustably located upon the stem 32 by a set screw 36.

Another collar 37 is adj ustably mounted. upon the lever 31 and is adapted to assume various adjusted positions by a set screw 38. The collar 37 is pivotally mounted upon a lug 39 projecting from a follower 40 threadedly engaged upon a screw 41 rotatively supported on standards 42 projecting from the plate 12. The screw 41 is formed with a head 43 for manual adjustments. A tension spring 44 acts between the end of the lever 31 adjacent the foot 18 and a projection 45 from the plate 12. A gear 46 is rotatively mounted upon the screw 29 which supports the drum 17 and meshes with the side rack 33 as may be seen from an inspection of Fig. 1. The gear 46 carries a spring urged pawl 47 engaging against a ratchet wheel 48 fixed upon the roller 17 The operation of the device may be understood by considering a fabric with a run engaged between the idler rollers 13 and 14 and the rollers 10 and 11, as indicated by the dot and dash lines 20. The pressure foot of the sewing machine may be raised to disengage the idler rollers from the rollers 10 and 11 so that the fabric may be engaged in place. The fabric is so adjusted beneath the spreading means 16 and the idler rollers 13 and 14 so that the run aligns with the space between the rollers 10 and 11. It is also so ad justed that the needle 21 may engage through the space before the first tranverse thread of the run.

The operation of the needle 21 need not be given here in detail since such operation is generally known in the trade. It may be briefly reviewed as stating that the hook of the needle first engages beneath the first transverse thread and then moves upwards for drawing up a loop, next moves down so that the pivoted latch member 50 of the needle engages beneath the loop just drawn, and when the needle is next raised the latch member slips this loop over the second thread which is now drawn up by the hook of the needle into a loop. In this manner the needle moves up and down and loops together all of the transverse threads. It is necessary that the last transverse thread be sewed down with a needle and thread so that the run does not reopen upon conclusion.

It is necessary that the means for periodically turning said driver drum 17 be so timed as to advance the sheer fabric indicated by 2-0 one transverse thread of the run each time the needle makes a complete cycle, that is, an up and down movement, and that the advancing be so timed that the hook of the needle properly draws the transverse thread and thereafter the latch member of the needle properly slides the drawn loop over the new drawn loop of the next transverse thread. This timing is possible by loosening the set screw 38 and then turning the screw 41 so that the follower 40 moves along the screw and moves the collar 37 to different adjusted positions upon the lever 31. Next the screw 38 is reengaged. The adjustment of the collar 37 upon the lever 31 changes the moment relation of the motion of the foot 18 and the rack33 so that when the foot 18 is periodically moved by the cloth advance 19 of the sewing machine, this motion will be trans mitted to turn the driver drum 17 the correct amount. The collar 35 may be adjusted upon the stem '32 so as to limit the position of the foot 18 with respect to the cloth feeder 19, as determined by the draw of the spring 44. The driver drum 17 rotates only in one direction, even though the rack 33 reciprocates, the reason for this being that the gear 46 may idle back over the ratchet.

While we have shown and described the preferred embodiment of our invention, it is to be understood that we do not limit ourselves to the precise construction herein disclosed and the right is reserved to all changes and modifications coming within the scope of the invention as defined in the appended claims.

Having thus described our invention, what we claim as new, and desire to secure by United States Letters Patent is 1. A sewing machine attachment for mending runs in sheer fabrics, comprising a pair of spaced ribbed rollers rotatively supported on a substitute bobbin cover plate of a sewing machine, a pair of spaced ribbed idler rollers engageable against said rollers and supported on a stem for attachment on the presser foot of said sewing machine, fabric spreading means for support on said stem and engageable against said first rollers, a ribbed driver drum engaging against said first rollers, and supported on said cover plate, and means for periodically turning said driver drum and including a footin the path of motion of the cloth feeder of.

said sewing machine for advancing sheer fabric between said first and second rollers timed with a latch needle substituted for the sewin needle of said sewing machine.

2. A sewing machine attachment for mending runs in sheer fabrics, comprising a pair of spaced ribbed'rollers rotatively supported on a substitute bobbin cover plate of a sewing machine, a pair of spaced ribbed idler rollers engageable against said rollers and supported on a stem for attachment on the presser foot of said sewing machine, fabric spreading means for support on said stem and engageable against said first rollers, a ribbed driver drum engaging against said first rollers and supported onsaid cover plate, and means for periodically turning said driver drum and including a foot in the path of motion of the cloth feeder of said sewing machine for advancing sheer fabric between said first and second rollers timed with a latch needle substituted for the sewing needle of said sewing machine, said ribbed rollers being rubber coated so as to be comprising teeth of the same pitch for meshing with each other.

3. A sewing machine attachment for mending runs in sheer fabrics, comprising a pair of spaced ribbed rollers rotatively supported on a substitute bobbin cover plate of a sewing machine, a pair of spaced ribbed idler rollers engageable against said rollers and supported on a stem for attachment on the presser foot of said sewing machine, fabric spreading means for support on said stem and engageable against said first rollers, ribbed driver drum engaging against said first rollers and supported on said cover plate, and means for periodically turning said driver drum and including a foot in the path of motion of the cloth feeder of said sewing machine for advancing sheer fabric between said first and second rollers timed with a latch needle substituted for the sewing needle of said sewing machine, said fabric spreading means comprising a spring attached upon said stem and formed with spaced fingers engaging against said first mentioned pair of spaced ribbed rollers.

4. A sewing machine attachment for mending runs in sheer fabrics, comprising a pair -of spaced ribbed rollers rotatively supported on a substitute bobbin cover late of a sewing machine, a pair of spaced ri bed idler rollers engageable against said rollers and supported on a stem for attachment on the presser foot of said sewing machine, fabric spreading means for support on said stem and engageable against said first rollers, a ribbed driver drum engaging against said first rollers and supported on said cover plate, and means for periodically turning said driver drum and including a foot in the path of motion of the cloth feeder of said sewing machine for advancing sheer fabric between said first and second rollers timed with a latch needle substituted for the sewing needle of said sewing machine, the rotative mounting of the first mentioned pair of spaced rollers and said driver drum upon said plate being accomplished by a block attached upon the plate and screws engaged through said elements and into said block.

5. A sewing machine attachment for mending runs in sheer fabrics, comprising a pair of spaced ribbed rollers rotatively supported on a substitute bobbin cover plate of a sewing machine, a pair of spaced ribbed idler rollers engageable against said rollers and supported on a stem for attachment on the presser foot of said sewing machine, fabric spreading means for support on said stem and engageable against said first rollers, a ribbed driver drum engaging against said first rollers and supported on said cover plate, and means for periodically turning said driver drum and including a foot in the path of motion of the cloth feeder of said sewing machine for advancing sheer fabric between said first and second rollers timed with a latch needle substituted for the sewing nee, dle of said sewing machine, said latter means comprising linkage transmitting motions from said foot to a slidable rack, a gear meshing with said rack and idly mounted coaxial with said driver drum, and a pawl mounted on said gear and engaging a ratchet fixed upon said driver drum.

6- A sewing machine attachment for mending runs in sheer fabrics, comprising a pair of spaced ribbed rollers rotatively supported on a substitute bobbin cover plate of a sewing machine, a pair of spaced ribbed idler rollers engageable against said rollers and supported on a stem for attachment on the presser foot of said sewing machine, fabric spreading means for support on said stem and engageable against said first rollers, a ribbed driver drum engaging against said first rollers and supported on said cover plate, and means for periodically turning said driver drum and includin a foot in the path of motion, of the cloth eeder of said sewing machine for advancing sheer fabric between said first and second rollers timed with a latch needle substituted for the sewing needle of said sewing machine, said latter means comprising a pivotally supported lever connected with said foot, a slidable rack connected with said lever, a gear meshing with said rack and coaxial with said driver drum, a pawl carried by said gear and meshing with a ratchet attached on said driver drum, and means for changing the point of pivoting of the lever interposed between said foot and said rack.

In testimony whereof we have affixed our 

